condition mean min max ZT0-3 2230.5 2230.5 2230.5 ZT4-7 1842.6 1842.6 1842.6 ZT8-11 1939.9499999999998 1939.9499999999998 1939.9499999999998 ZT12-15 1691.5 1691.5 1691.5 ZT16-19 1970.05 1970.05 1970.05 ZT20-23 2224.8 2224.8 2224.8